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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.annotation;
import java.util.ListIterator;
/**
* @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
*/
class InvalidatingIterator implements ListIterator<SpanNode> {
private SpanList owner;
private ListIterator<SpanNode> base;
private SpanNode returnedFromNext = null;
InvalidatingIterator(SpanList owner, ListIterator<SpanNode> base) {
this.owner = owner;
this.base = base;
}
@Override
public boolean hasNext() {
returnedFromNext = null;
return base.hasNext();
}
@Override
public SpanNode next() {
SpanNode retval = null;
try {
retval = base.next();
} finally {
returnedFromNext = retval;
}
return returnedFromNext;
}
@Override
public boolean hasPrevious() {
returnedFromNext = null;
return base.hasPrevious();
}
@Override
public SpanNode previous() {
returnedFromNext = null;
return base.previous();
}
@Override
public int nextIndex() {
returnedFromNext = null;
return base.nextIndex();
}
@Override
public int previousIndex() {
returnedFromNext = null;
return base.previousIndex();
}
@Override
public void remove() {
if (returnedFromNext != null) {
returnedFromNext.setInvalid();
returnedFromNext.setParent(null);
owner.resetCachedFromAndTo();
}
returnedFromNext = null;
base.remove();
}
@Override
public void set(SpanNode spanNode) {
if (returnedFromNext != null) {
returnedFromNext.setInvalid();
returnedFromNext.setParent(null);
}
owner.resetCachedFromAndTo();
returnedFromNext = null;
base.set(spanNode);
}
@Override
public void add(SpanNode spanNode) {
returnedFromNext = null;
owner.resetCachedFromAndTo();
base.add(spanNode);
}
}
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